Astronomy:Nu Pegasi
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Short description: Star in the constellation Pegasus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 05m 40.75170s[1] |
| Declination | 5° 03′ 30.7201″[1] |
| Apparent magnitude (V) | 4.84[2] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K4III[4] |
| U−B color index | +1.80[2] |
| B−V color index | +1.44[2] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −18.90[6] km/s |
| Proper motion (μ) | RA: +101.759[7] mas/yr Dec.: +100.923[7] mas/yr |
| Parallax (π) | 12.4810 ± 0.3322[7] mas |
| Distance | 261 ± 7 ly (80 ± 2 pc) |
| Absolute magnitude (MV) | 0.26[8] |
| Details[9] | |
| Mass | 1.13 M☉ |
| Radius | 24.57 R☉ |
| Luminosity | 149 L☉ |
| Surface gravity (log g) | 1.72 cgs |
| Temperature | 4,073 K |
| Metallicity [Fe/H] | +0.02 dex |
| Rotational velocity (v sin i) | 2.3[10] km/s |
| Age | 8.1+2.3 −0.4[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
ν Pegasi, Latinized as Nu Pegasi is a single[12] star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84.[2] The star is located approximately 261 light years away based on parallax,[7] but is drifting closer with a radial velocity of −19 km/s.[6]
This is an aging giant star, most likely (94% chance) on the red giant branch,[3] with a stellar classification of K4III.[4] It is a suspected variable, with a magnitude range observed from 4.83 to 4.86.[5] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24.6 times the Sun's radius. It is 13% more massive than the Sun and is radiating 149 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,073 K.[9]
References
- ↑ 1.0 1.1 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 3.2 Stock, Stephan et al. (August 2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy & Astrophysics 616: 15. doi:10.1051/0004-6361/201833111. A33. Bibcode: 2018A&A...616A..33S.
- ↑ 4.0 4.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 5.0 5.1 Samus, N. N. et al. (2009). "General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ 6.0 6.1 Famaey, B. et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics 430: 165–186. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ 7.0 7.1 7.2 7.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 9.0 9.1 Reffert, Sabine et al. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics 574: A116. doi:10.1051/0004-6361/201322360. Bibcode: 2015A&A...574A.116R. Vizier catalog entry
- ↑ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433. doi:10.1051/aas:1999401. Bibcode: 1999A&AS..139..433D. Vizier catalog entry
- ↑ "nu. Peg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Peg.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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